US5077130AExpiredUtility

Carbon fiber-reinforced carbon composite material

85
Assignee: MITSUBISHI CHEM INDPriority: Jul 1, 1986Filed: Jul 18, 1989Granted: Dec 31, 1991
Est. expiryJul 1, 2006(expired)· nominal 20-yr term from priority
Inventors:Kohei OkuyamaKazushi Matsuura
Y10T428/249953Y10T428/2918F16D 69/023Y10T428/30C04B 35/83Y10T428/249924
85
PatentIndex Score
46
Cited by
14
References
7
Claims

Abstract

A carbon fiber-reinforced carbon composite material having a porosity of not higher than 20% prepared by subjecting a carbon fiber-reinforced carbon composite material having a porosity of from 25 to 95% to densification treatment, wherein the densification treatment is conducted with pyrolytic carbon formed by the pyrolysis of a halogenated hydrocarbon-containing gas at a temperature of from 400 DEG to 800 DEG C.

Claims

exact text as granted — not AI-modified
We claim: 
     
       1. A carbon fiber-reinforced carbon composite material having a porosity of not higher than 20% prepared by subjecting a carbon fiber-reinforced carbon composite material having a porosity of from 25 to 95% to densification treatment, wherein the densification treatment is conducted with pyrolytic carbon formed by the pyrolysis of a halogenated hydrocarbon-containing gas at a temperature of from 400° to 800° C., wherein the pyrolytic carbon formed in the pores of the composite material subjected to the densification treatment has a lattice spacing of graphite crystal of at least 3.7 Å and a crystal thickness of at most 12 Å, as measured by an X-ray diffraction method. 
     
     
       2. The composite material according to claim 1, wherein the densification treatment is conducted with pyrolytic carbon formed by the pyrolysis of a halogenated hydrocarbon-containing gas at a temperature of from 400° to 800° C. and with carbon obtained by the impregnation and baking of a pitch material or a resin. 
     
     
       3. The composite material according to claim 1, wherein the halogenated hydrocarbon is a chlorinated hydrocarbon. 
     
     
       4. The composite material according to claim 1, wherein the porosity of the carbon fiber-reinforced carbon composite material prior to the densification treatment is from 30 to 60%. 
     
     
       5. The composite material according to claim 1, wherein the porosity finally obtained by the densification treatment is from 5 to 15%. 
     
     
       6. The composite material according to claim 1, wherein the halogenated hydrocarbon is dichloroethylene, dichloroethane or trichloroethane. 
     
     
       7. The composite material according to claim 6, wherein the halogenated hydrocarbon is dichloroethylene.

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